Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos jogos terminaram em empate durante o período de 2011-2013 com uma porcentagem de vitória inferior a 80%?
 ###Tabelas: CREATE TABLE seasonal_ratings_broadcast_history (seasonal_ratings_broadcast_history_id AUTO_INCREMENT PRIMARY KEY, Season INT, Network VARCHAR, Time slot VARCHAR, Season premiere VARCHAR, Season finale VARCHAR, Episode count INT, TV season VARCHAR, Season rank VARCHAR, Viewers (in millions) INT) CREATE TABLE result_summary (result_summary_id AUTO_INCREMENT PRIMARY KEY, Opposition VARCHAR, Span VARCHAR, Lost INT, Tied INT, Win % INT) CREATE TABLE relegation_table (relegation_table_id AUTO_INCREMENT PRIMARY KEY, Place INT, Team VARCHAR, Played INT, Draw INT, Lost INT, Goals Scored INT, Goals Conceded INT, Points INT) CREATE TABLE managerial_statistics (managerial_statistics_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Nation VARCHAR, From VARCHAR, Matches INT, Drawn INT, Lost INT, Win % INT) CREATE TABLE nominations_table (nominations_table_id AUTO_INCREMENT PRIMARY KEY, Week 1 VARCHAR, Week 3 VARCHAR, Week 4 VARCHAR, Week 6 VARCHAR, Week 7 VARCHAR, Week 8 VARCHAR, Week 9 VARCHAR, Week 10 VARCHAR, Final Week 12 VARCHAR)  
SELECT COUNT Tied FROM result_summary WHERE Span = 2011–2013 AND Win % < 80